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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.maven.mae;

import org.apache.maven.mae.conf.MAELibrary;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;

import javax.inject.Inject;
import javax.inject.Named;

import java.util.HashMap;
import java.util.Map;

@Component( role = MAEAdvisor.class )
public class MAEAdvisor
{

    private final Map advice = new HashMap();

    @Requirement( hint = "core" )
    private final MAELibrary library;

    @Inject
    public MAEAdvisor( @Named( "core" ) final MAELibrary library )
    {
        this.library = library;
    }

    public MAEAdvisor advise( final String key, final Object value, final boolean override )
    {
        if ( override || !advice.containsKey( key ) )
        {
            library.getLogger().debug( "NEW ADVICE: " + key + " = " + value );
            advice.put( key, value );
        }

        return this;
    }

    public Object getRawAdvice( final String key )
    {
        return advice.get( key );
    }

    public  T getAdvice( final String key, final Class adviceType )
        throws MAEException
    {
        try
        {
            return adviceType.cast( advice.get( key ) );
        }
        catch ( final ClassCastException e )
        {
            throw new MAEException( "Invalid type for advice: %s.\nExpected type: %s\nActual type: %s", e, key,
                                    adviceType.getName(), advice.get( key ).getClass().getName() );
        }
    }

}